Programming fun: C # completely delete files

It is often used to smash 360 of files, and it seems pretty good to delete private files. However, C # can also completely delete files. I tried to restore the source file with the 360 file.

The Code is as follows:

 public class AbsoluteFile    {        public event EventHandler FinishDeleteFileEvent = null;        public event EventHandler FinishDeleteFolderEvent = null;        public event EventHandler DeleteErrorEvent = null;        public string ErrorString = string.Empty;        public void DoAbsoluteDeleteFile(object filePath)        {            try            {                string filename = filePath.ToString();                if (string.IsNullOrEmpty(filename))                {                    return;                }                if (File.Exists(filename))                {                    File.SetAttributes(filename, FileAttributes.Normal);                                       double sectors = Math.Ceiling(new FileInfo(filename).Length / 512.0);                                       byte[] dummyBuffer = new byte[512];                                       RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider();                                       FileStream inputStream = new FileStream(filename, FileMode.Open);                    inputStream.Position = 0;                                       for (int sectorsWritten = 0; sectorsWritten < sectors; sectorsWritten++)                    {                        rng.GetBytes(dummyBuffer);                        inputStream.Write(dummyBuffer, 0, dummyBuffer.Length);                        sectorsWritten++;                    }                    inputStream.SetLength(0);                    inputStream.Close();                                       DateTime dt = new DateTime(2049, 1, 1, 0, 0, 0);                    File.SetCreationTime(filename, dt);                    File.SetLastAccessTime(filename, dt);                    File.SetLastWriteTime(filename, dt);                    File.Delete(filename);                    WipeDone();                }            }            catch (Exception e)            {                WipeError(e);            }        }        public void DoDeleteFolder(object folder)        {            string folderPath = folder.ToString();            if (string.IsNullOrEmpty(folderPath))            {                return;            }            DirectoryInfo direct = new DirectoryInfo(folderPath);            FileSystemInfo[] filesystem = direct.GetFileSystemInfos();            if (filesystem == null || filesystem.Length == 0)            {                direct.Delete();            }            else            {                foreach (FileSystemInfo fileItem in filesystem)                {                    if (fileItem is FileInfo)                    {                        this.DoAbsoluteDeleteFile(fileItem.FullName);                    }                    else                    {                        DoDeleteFolder(fileItem.FullName);                    }                }            }            if (this.FinishDeleteFolderEvent != null)            {                this.FinishDeleteFolderEvent(this, null);            }        }        private void WipeError(Exception e)        {            if (DeleteErrorEvent != null)            {                ErrorString = e.Message;                DeleteErrorEvent(this, null);            }        }        private void WipeDone()        {            if (FinishDeleteFileEvent != null)            {                FinishDeleteFileEvent(this, null);            }        }    }

By the way, I wrote a simple interface:

Background:

Public partial class Form1: Form {private Thread dfileThread = null; private string fileObjectPath = string. empty; private bool isFile = true; public delegate void encode (object sender, EventArgs e); public Form1 () {InitializeComponent ();} private void btnSelectFile_Click (object sender, EventArgs e) {isFile = true; this. openFileDialog1 = new OpenFileDialog (); openFileDialog1.Multi Select = true; openFileDialog1.Title = "select a file"; openFileDialog1.Filter = "all files (*. *) | *. * "; if (openFileDialog1.ShowDialog () = DialogResult. OK) {this.txt FilePath. text = openFileDialog1.FileName;} fileObjectPath = this.txt FilePath. text. trim ();} private void btnSelectFolder_Click (object sender, EventArgs e) {isFile = false; this. folderBrowserDialog1 = new FolderBrowserDialog (); folderBrowserDialo G1.Description = "select the file path"; if (folderBrowserDialog1.ShowDialog () = DialogResult. OK) {this.txt Folder. text = folderBrowserDialog1.SelectedPath;} fileObjectPath = this.txt Folder. text. trim ();} private void btnAbsoluteDelete_Click (object sender, EventArgs e) {this. lblHint. visible = true; if (string. isNullOrEmpty (fileObjectPath) {MessageBox. show ("select the file and folder to be crushed! "); Return;} AbsoluteFile dfile = new AbsoluteFile (); dfile. deleteErrorEvent + = new EventHandler (Dfile_DeleteErrorEvent); if (isFile) {dfile. finishDeleteFileEvent + = new EventHandler (Dfile_FinishDeleteFileEvent); dfileThread = new Thread (new ParameterizedThreadStart (dfile. doAbsoluteDeleteFile); dfileThread. isBackground = true; dfileThread. start (fileObjectPath);} else {dfile. finishDeleteFolderE Vent + = new EventHandler (Dfile_FinishDeleteFolderEvent); dfileThread = new Thread (new ParameterizedThreadStart (dfile. doDeleteFolder); dfileThread. isBackground = true; dfileThread. start (fileObjectPath);} this. lblHint. text = @ "deleting... ";} void Dfile_DeleteErrorEvent (object sender, EventArgs e) {if (! This. invokeRequired) {MessageBox. show (sender as AbsoluteFile ). errorString);} else {this. beginInvoke (new DefaulEventDelegate (Dfile_DeleteErrorEvent), new object [] {sender, e}) ;}} void Dfile_FinishDeleteFolderEvent (object sender, EventArgs e) {if (! This. InvokeRequired) {this. lblHint. Visible = false; MessageBox. Show ("deleted! ");} Else {this. beginInvoke (new DefaulEventDelegate (Dfile_FinishDeleteFolderEvent), new object [] {sender, e}) ;}} void Dfile_FinishDeleteFileEvent (object sender, EventArgs e) {if (! This. InvokeRequired) {this. lblHint. Visible = false; MessageBox. Show ("deleted! ") ;}Else {this. BeginInvoke (new DefaulEventDelegate (Dfile_FinishDeleteFileEvent), new object [] {sender, e });}}}

Download: http://download.csdn.net/detail/yysyangyangyangshan/6860431